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    <div class="doc-nav">
      <a href="#Documentation" class="nav-header">Documentation</a>
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        <ul class="nav-list">
          <li>
            <a href="#includes" class="nav-label">Includes</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#config.h" class="nav-sub-label">config.h</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CONFIG_FILE" class="nav-sub-label">MBEDTLS_CONFIG_FILE</a>
              </li>
      

              <li>
                <a href="#aes.h" class="nav-sub-label">aes.h</a>
              </li>
      

              <li>
                <a href="#threading.h" class="nav-sub-label">threading.h</a>
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            </ul>
            
          </li>
          <li>
            <a href="#macros" class="nav-label">Macros</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#MBEDTLS_CTR_DRBG_H" class="nav-sub-label">MBEDTLS_CTR_DRBG_H</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED" class="nav-sub-label">MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG" class="nav-sub-label">MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG" class="nav-sub-label">MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR" class="nav-sub-label">MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_BLOCKSIZE" class="nav-sub-label">MBEDTLS_CTR_DRBG_BLOCKSIZE</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_KEYSIZE" class="nav-sub-label">MBEDTLS_CTR_DRBG_KEYSIZE</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_KEYSIZE" class="nav-sub-label">MBEDTLS_CTR_DRBG_KEYSIZE</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_KEYBITS" class="nav-sub-label">MBEDTLS_CTR_DRBG_KEYBITS</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_SEEDLEN" class="nav-sub-label">MBEDTLS_CTR_DRBG_SEEDLEN</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_ENTROPY_LEN" class="nav-sub-label">MBEDTLS_CTR_DRBG_ENTROPY_LEN</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_ENTROPY_LEN" class="nav-sub-label">MBEDTLS_CTR_DRBG_ENTROPY_LEN</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_RESEED_INTERVAL" class="nav-sub-label">MBEDTLS_CTR_DRBG_RESEED_INTERVAL</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_MAX_INPUT" class="nav-sub-label">MBEDTLS_CTR_DRBG_MAX_INPUT</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_MAX_REQUEST" class="nav-sub-label">MBEDTLS_CTR_DRBG_MAX_REQUEST</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_MAX_SEED_INPUT" class="nav-sub-label">MBEDTLS_CTR_DRBG_MAX_SEED_INPUT</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_PR_OFF" class="nav-sub-label">MBEDTLS_CTR_DRBG_PR_OFF</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CTR_DRBG_PR_ON" class="nav-sub-label">MBEDTLS_CTR_DRBG_PR_ON</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_DEPRECATED" class="nav-sub-label">MBEDTLS_DEPRECATED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_DEPRECATED" class="nav-sub-label">MBEDTLS_DEPRECATED</a>
              </li>
      
            </ul>
            
          </li>
          <li>
            <a href="#functions" class="nav-label">Functions</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#mbedtls_ctr_drbg_init" class="nav-sub-label">mbedtls_ctr_drbg_init</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_seed" class="nav-sub-label">mbedtls_ctr_drbg_seed</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_free" class="nav-sub-label">mbedtls_ctr_drbg_free</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_set_prediction_resistance" class="nav-sub-label">mbedtls_ctr_drbg_set_prediction_resistance</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_set_entropy_len" class="nav-sub-label">mbedtls_ctr_drbg_set_entropy_len</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_set_reseed_interval" class="nav-sub-label">mbedtls_ctr_drbg_set_reseed_interval</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_reseed" class="nav-sub-label">mbedtls_ctr_drbg_reseed</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_update_ret" class="nav-sub-label">mbedtls_ctr_drbg_update_ret</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_random_with_add" class="nav-sub-label">mbedtls_ctr_drbg_random_with_add</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_random" class="nav-sub-label">mbedtls_ctr_drbg_random</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_write_seed_file" class="nav-sub-label">mbedtls_ctr_drbg_write_seed_file</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_update_seed_file" class="nav-sub-label">mbedtls_ctr_drbg_update_seed_file</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_self_test" class="nav-sub-label">mbedtls_ctr_drbg_self_test</a>
              </li>
      

              <li>
                <a href="#mbedtls_ctr_drbg_seed_entropy_len" class="nav-sub-label">mbedtls_ctr_drbg_seed_entropy_len</a>
              </li>
      
            </ul>
            
          </li>
          <li>
            <a href="#vars" class="nav-label">Vars</a>
             
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              <li>
                <a href="#MBEDTLS_DEPRECATED" class="nav-sub-label">MBEDTLS_DEPRECATED</a>
              </li>
      
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          <li>
            <a href="#consts" class="nav-label">Consts</a>
            
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            </ul>
            
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          <li>
            <a href="#types" class="nav-label">Types</a>
            
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            </ul>
            
          </li>
          <li>
            <a href="#typedefs" class="nav-label">Typedefs</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#
mbedtls_ctr_drbg_context;
" class="nav-sub-label">
mbedtls_ctr_drbg_context;
</a>
              </li>
      
            </ul>
            
          </li>
        </ul>
      </nav>
    </div>
    <div class="doc-content">
      <h2 id="Documentation" class="doc-title">Documentation</h2>
      <h3 id="includes">Includes</h3>
      

      <h4 id="config.h"><span>config.h</span></h4>
      <pre class="doc-declare"><code>#include "config.h"
</code></pre>
      <pre class="doc-comment">#include "config.h"
</pre>

      <h4 id="MBEDTLS_CONFIG_FILE"><span>MBEDTLS_CONFIG_FILE</span></h4>
      <pre class="doc-declare"><code>#include MBEDTLS_CONFIG_FILE
</code></pre>
      <pre class="doc-comment">#include MBEDTLS_CONFIG_FILE
</pre>

      <h4 id="aes.h"><span>aes.h</span></h4>
      <pre class="doc-declare"><code>#include "aes.h"
</code></pre>
      <pre class="doc-comment">#include "aes.h"
</pre>

      <h4 id="threading.h"><span>threading.h</span></h4>
      <pre class="doc-declare"><code>#include "threading.h"
</code></pre>
      <pre class="doc-comment">#include "threading.h"
</pre>
      <h3 id="macros">Macros</h3>
      

      <h4 id="MBEDTLS_CTR_DRBG_H">Marco <span>MBEDTLS_CTR_DRBG_H</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_H
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED">Marco <span>MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED       -52 /**< The entropy source failed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG">Marco <span>MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG             -54 /**< The requested random buffer length is too big. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG">Marco <span>MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG               -56 /**< The input (entropy + additional data) is too large. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR">Marco <span>MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR               -3A /**< Read or write error in file. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_BLOCKSIZE">Marco <span>MBEDTLS_CTR_DRBG_BLOCKSIZE</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_BLOCKSIZE         16 /**< The block size used by the cipher. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_KEYSIZE">Marco <span>MBEDTLS_CTR_DRBG_KEYSIZE</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_KEYSIZE           16 /**< The key size used by the cipher (compile-time choice: 128 bits). */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_KEYSIZE">Marco <span>MBEDTLS_CTR_DRBG_KEYSIZE</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_KEYSIZE           32 /**< The key size used by the cipher (compile-time choice: 256 bits). */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_KEYBITS">Marco <span>MBEDTLS_CTR_DRBG_KEYBITS</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_KEYBITS           ( MBEDTLS_CTR_DRBG_KEYSIZE * 8 ) /**< The key size for the DRBG operation, in bits. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_SEEDLEN">Marco <span>MBEDTLS_CTR_DRBG_SEEDLEN</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_SEEDLEN           ( MBEDTLS_CTR_DRBG_KEYSIZE + MBEDTLS_CTR_DRBG_BLOCKSIZE ) /**< The seed length, calculated as (counter + AES key). */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_ENTROPY_LEN">Marco <span>MBEDTLS_CTR_DRBG_ENTROPY_LEN</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_ENTROPY_LEN       48
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_ENTROPY_LEN">Marco <span>MBEDTLS_CTR_DRBG_ENTROPY_LEN</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_ENTROPY_LEN       32
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_RESEED_INTERVAL">Marco <span>MBEDTLS_CTR_DRBG_RESEED_INTERVAL</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_RESEED_INTERVAL   10000
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_MAX_INPUT">Marco <span>MBEDTLS_CTR_DRBG_MAX_INPUT</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_MAX_INPUT         256
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_MAX_REQUEST">Marco <span>MBEDTLS_CTR_DRBG_MAX_REQUEST</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_MAX_REQUEST       1024
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_MAX_SEED_INPUT">Marco <span>MBEDTLS_CTR_DRBG_MAX_SEED_INPUT</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_MAX_SEED_INPUT    384
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_PR_OFF">Marco <span>MBEDTLS_CTR_DRBG_PR_OFF</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_PR_OFF            0
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_CTR_DRBG_PR_ON">Marco <span>MBEDTLS_CTR_DRBG_PR_ON</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_CTR_DRBG_PR_ON             1
</code></pre>
      <pre class="doc-comment">/**< Prediction resistance is disabled. */</pre>

      <h4 id="MBEDTLS_DEPRECATED">Marco <span>MBEDTLS_DEPRECATED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_DEPRECATED   __attribute__((deprecated))
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_DEPRECATED">Marco <span>MBEDTLS_DEPRECATED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_DEPRECATED
</code></pre>
      <pre class="doc-comment"></pre>
      <h3 id="functions">Functions</h3>
      

      <h4 id="mbedtls_ctr_drbg_init">Func <span>mbedtls_ctr_drbg_init</span></h4>
      <pre class="doc-declare"><code>void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function initializes the CTR_DRBG context,
 *                      and prepares it for mbedtls_ctr_drbg_seed()
 *                      or mbedtls_ctr_drbg_free().
 *
 * \param ctx           The CTR_DRBG context to initialize.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_seed">Func <span>mbedtls_ctr_drbg_seed</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
                  int (*f_entropy)(void *, unsigned char *, size_t),
                  void *p_entropy,
                  const unsigned char *custom,
                  size_t len );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function seeds and sets up the CTR_DRBG
 *                      entropy source for future reseeds.
 *
 * \note Personalization data can be provided in addition to the more generic
 *       entropy source, to make this instantiation as unique as possible.
 *
 * \param ctx           The CTR_DRBG context to seed.
 * \param f_entropy     The entropy callback, taking as arguments the
 *                      \p p_entropy context, the buffer to fill, and the
                        length of the buffer.
 * \param p_entropy     The entropy context.
 * \param custom        Personalization data, that is device-specific
                        identifiers. Can be NULL.
 * \param len           The length of the personalization data.
 *
 * \return              \c 0 on success.
 * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_free">Func <span>mbedtls_ctr_drbg_free</span></h4>
      <pre class="doc-declare"><code>void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function clears CTR_CRBG context data.
 *
 * \param ctx           The CTR_DRBG context to clear.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_set_prediction_resistance">Func <span>mbedtls_ctr_drbg_set_prediction_resistance</span></h4>
      <pre class="doc-declare"><code>void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx,
                                        int resistance );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function turns prediction resistance on or off.
 *                      The default value is off.
 *
 * \note                If enabled, entropy is gathered at the beginning of
 *                      every call to mbedtls_ctr_drbg_random_with_add().
 *                      Only use this if your entropy source has sufficient
 *                      throughput.
 *
 * \param ctx           The CTR_DRBG context.
 * \param resistance    #MBEDTLS_CTR_DRBG_PR_ON or #MBEDTLS_CTR_DRBG_PR_OFF.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_set_entropy_len">Func <span>mbedtls_ctr_drbg_set_entropy_len</span></h4>
      <pre class="doc-declare"><code>void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx,
                              size_t len );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function sets the amount of entropy grabbed on each
 *                      seed or reseed. The default value is
 *                      #MBEDTLS_CTR_DRBG_ENTROPY_LEN.
 *
 * \param ctx           The CTR_DRBG context.
 * \param len           The amount of entropy to grab.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_set_reseed_interval">Func <span>mbedtls_ctr_drbg_set_reseed_interval</span></h4>
      <pre class="doc-declare"><code>void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx,
                                  int interval );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function sets the reseed interval.
 *                      The default value is #MBEDTLS_CTR_DRBG_RESEED_INTERVAL.
 *
 * \param ctx           The CTR_DRBG context.
 * \param interval      The reseed interval.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_reseed">Func <span>mbedtls_ctr_drbg_reseed</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
                    const unsigned char *additional, size_t len );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function reseeds the CTR_DRBG context, that is
 *                      extracts data from the entropy source.
 *
 * \param ctx           The CTR_DRBG context.
 * \param additional    Additional data to add to the state. Can be NULL.
 * \param len           The length of the additional data.
 *
 * \return              \c 0 on success.
 * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_update_ret">Func <span>mbedtls_ctr_drbg_update_ret</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_update_ret( mbedtls_ctr_drbg_context *ctx,
                                const unsigned char *additional,
                                size_t add_len );</code></pre>
      <pre class="doc-comment">/**
 * \brief              This function updates the state of the CTR_DRBG context.
 *
 * \param ctx          The CTR_DRBG context.
 * \param additional   The data to update the state with.
 * \param add_len      Length of \p additional in bytes. This must be at
 *                     most #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT.
 *
 * \return             \c 0 on success.
 * \return             #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG if
 *                     \p add_len is more than
 *                     #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT.
 * \return             An error from the underlying AES cipher on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_random_with_add">Func <span>mbedtls_ctr_drbg_random_with_add</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_random_with_add( void *p_rng,
                             unsigned char *output, size_t output_len,
                             const unsigned char *additional, size_t add_len );</code></pre>
      <pre class="doc-comment">/**
 * \brief   This function updates a CTR_DRBG instance with additional
 *          data and uses it to generate random data.
 *
 * \note    The function automatically reseeds if the reseed counter is exceeded.
 *
 * \param p_rng         The CTR_DRBG context. This must be a pointer to a
 *                      #mbedtls_ctr_drbg_context structure.
 * \param output        The buffer to fill.
 * \param output_len    The length of the buffer.
 * \param additional    Additional data to update. Can be NULL.
 * \param add_len       The length of the additional data.
 *
 * \return    \c 0 on success.
 * \return    #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
 *            #MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_random">Func <span>mbedtls_ctr_drbg_random</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_random( void *p_rng,
                    unsigned char *output, size_t output_len );</code></pre>
      <pre class="doc-comment">/**
 * \brief   This function uses CTR_DRBG to generate random data.
 *
 * \note    The function automatically reseeds if the reseed counter is exceeded.
 *
 * \param p_rng         The CTR_DRBG context. This must be a pointer to a
 *                      #mbedtls_ctr_drbg_context structure.
 * \param output        The buffer to fill.
 * \param output_len    The length of the buffer.
 *
 * \return              \c 0 on success.
 * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
 *                      #MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_write_seed_file">Func <span>mbedtls_ctr_drbg_write_seed_file</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function writes a seed file.
 *
 * \param ctx           The CTR_DRBG context.
 * \param path          The name of the file.
 *
 * \return              \c 0 on success.
 * \return              #MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR on file error.
 * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on
 *                      failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_update_seed_file">Func <span>mbedtls_ctr_drbg_update_seed_file</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );</code></pre>
      <pre class="doc-comment">/**
 * \brief               This function reads and updates a seed file. The seed
 *                      is added to this instance.
 *
 * \param ctx           The CTR_DRBG context.
 * \param path          The name of the file.
 *
 * \return              \c 0 on success.
 * \return              #MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR on file error.
 * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
 *                      #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_self_test">Func <span>mbedtls_ctr_drbg_self_test</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_self_test( int verbose );</code></pre>
      <pre class="doc-comment">/**
 * \brief               The CTR_DRBG checkup routine.
 *
 * \return              \c 0 on success.
 * \return              \c 1 on failure.
 */</pre>

      <h4 id="mbedtls_ctr_drbg_seed_entropy_len">Func <span>mbedtls_ctr_drbg_seed_entropy_len</span></h4>
      <pre class="doc-declare"><code>int mbedtls_ctr_drbg_seed_entropy_len( mbedtls_ctr_drbg_context *,
                              int (*)(void *, unsigned char *, size_t), void *,
                              const unsigned char *, size_t, size_t );</code></pre>
      <pre class="doc-comment">/* Internal functions (do not call directly) */</pre>
      <h3 id="vars">Vars</h3>
      

      <h4 id="MBEDTLS_DEPRECATED">Variable <span>MBEDTLS_DEPRECATED</span></h4>
      <pre class="doc-declare"><code>MBEDTLS_DEPRECATED void mbedtls_ctr_drbg_update(
   mbedtls_ctr_drbg_context *ctx,
   const unsigned char *additional,
   size_t add_len );</code></pre>
      <pre class="doc-comment">/**
 * \brief              This function updates the state of the CTR_DRBG context.
 *
 * \deprecated         Superseded by mbedtls_ctr_drbg_update_ret()
 *                     in 2.16.0.
 *
 * \note               If \p add_len is greater than
 *                     #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT, only the first
 *                     #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT Bytes are used.
 *                     The remaining Bytes are silently discarded.
 *
 * \param ctx          The CTR_DRBG context.
 * \param additional   The data to update the state with.
 * \param add_len      Length of \p additional data.
 */</pre>
      <h3 id="consts">Consts</h3>
      
      <h3 id="types">Types</h3>
      
      <h3 id="typedefs">Typedefs</h3>
      

      <h4 id="
mbedtls_ctr_drbg_context;
">Typedef <span>
mbedtls_ctr_drbg_context;
</span></h4>
      <pre class="doc-declare"><code>typedef struct mbedtls_ctr_drbg_context
{
   unsigned char counter[16]; /*!< The counter (V). */
   int reseed_counter;        /*!< The reseed counter. */
   int prediction_resistance; /*!< This determines whether prediction
                                     resistance is enabled, that is
                                     whether to systematically reseed before
                                     each random generation. */
   size_t entropy_len;        /*!< The amount of entropy grabbed on each
                                     seed or reseed operation. */
   int reseed_interval;       /*!< The reseed interval. */

   mbedtls_aes_context aes_ctx;       /*!< The AES context. */

   /*
     * Callbacks (Entropy)
     */
   int (*f_entropy)(void *, unsigned char *, size_t);
                               /*!< The entropy callback function. */

   void *p_entropy;           /*!< The context for the entropy function. */

#if defined(MBEDTLS_THREADING_C)
   mbedtls_threading_mutex_t mutex;
#endif
}
mbedtls_ctr_drbg_context;
</code></pre>
      <pre class="doc-comment">/**
 * \brief          The CTR_DRBG context structure.
 */</pre>
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